package com.heima.admin.gateway.filter;

import com.heima.admin.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Order(value = 0)
public class AdminAuthFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断登录
        if (request.getURI().getPath().contains("/login")) {
            return chain.filter(exchange);
        }

        //获取token
        String token = request.getHeaders().getFirst("token");

        //判断token存在
        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //判断token过期
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int result = AppJwtUtil.verifyToken(claimsBody);
        //如果是1或者2则过期了
        if (result == 1 || result == 2) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Object userId = claimsBody.get("id");

        ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
            httpHeaders.add("userId", userId + "");
        }).build();

        //重置header
        exchange.mutate().request(serverHttpRequest).build();


        return chain.filter(exchange);
    }
}
